[ { "regions": [ { "regionID": "CH-5112" }, { "regionID": "CH-5121" }, { "regionID": "CH-5214" }, { "regionID": "CH-5113" }, { "regionID": "CH-5122" }, { "regionID": "CH-5123" }, { "regionID": "CH-5111" }, { "regionID": "CH-5124" }, { "regionID": "CH-7113" }, { "regionID": "CH-7114" }, { "regionID": "CH-7115" }, { "regionID": "CH-7231" }, { "regionID": "CH-7126" }, { "regionID": "CH-7125" }, { "regionID": "CH-7124" }, { "regionID": "CH-7123" }, { "regionID": "CH-7122" }, { "regionID": "CH-7121" }, { "regionID": "CH-5222" }, { "regionID": "CH-5234" }, { "regionID": "CH-5231" }, { "regionID": "CH-5232" }, { "regionID": "CH-5221" } ], "validTime": { "startTime": "2021-05-17T17:00:00+02:00", "endTime": "2021-05-18T17:00:00+02:00" }, "source": {}, "dangerRatings": [ { "elevation": { "lowerBound": "2400" }, "customData": [], "mainValue": "moderate", "aspect": [ "N", "NE", "E", "SE", "S", "SW", "W", "NW" ] } ], "avalancheProblems": [], "tendency": { "validTime": {}, "tendencyComment": "Wednesday: In the north there will be variable cloud with precipitation and occasional sunny spells. The snowfall level will be approximately 1300 m to 1500 m. On the southern flank of the Alps it will be quite sunny with convective cloud and local showers as the day progresses. \n The danger of dry avalanches will not change significantly. In the regions with precipitation, moist snow avalanches are likely to be released in the fresh snow in case of exposure to solar radiation. On each of the coming days in the south, the danger of wet snow avalanches will increase as the day progresses. \nThursday: Wednesday night will be predominantly clear on the southern flank of the Alps. Otherwise, a little further precipitation will fall over a wide area; above approximately 1400 m it will fall as snow. During the day it will be mostly sunny in the west and south. The east will become increasingly sunny once the residual cloud disperses in the morning. \n The danger of dry avalanches will decrease slowly. The danger of wet snow avalanches will vary during the day." }, "publicationTime": "2021-05-17T17:00:00+02:00", "avalancheActivityHighlights": "Considerable avalanche danger will be encountered over a wide area", "snowpackStructureComment": "A sometimes strong southwesterly to northwesterly wind has transported the fresh snow and loosely bonded old snow near the surface in recent days. Snow drift accumulations have formed, some of which are deep. Fresh snow and snow drift accumulations are prone to triggering at elevated altitudes. In some places, avalanches can release deeper layers of the snowpack. At elevated altitudes, conditions are more wintry than usual at this time of year. \n The old snowpack is thoroughly moist below 2500 m on north facing slopes, and up to approximately 3000 m on east, south and west facing slopes. Both wet snow and gliding avalanches remain possible, in particular under the influence of solar radiation.", "wxSynopsisComment": "Sunday night was mostly very cloudy, except in the far south. Precipitation fell over a wide area, most heavily in the west. The snowfall level dropped during the night to approximately 1400 m. During the day it was mostly very cloudy in the west, but there was variable cloud with showers and sunny spells in the north. The snowfall level was approximately 1600 m. On the southern flank of the Alps it was quite sunny with a northerly wind, but convective cloud built up during the day. \nFresh snow: From Sunday afternoon until Monday afternoon, 20 to 40 cm of snow fell in Lower Valais, and 10 to 20 cm fell in the rest of Valais and on the rest of the northern Alpine ridge, as well as in some regions of northern Grisons and in Lower Engadine. Given the showery nature of the precipitation, local differences in the amounts were substantial in some cases. From Saturday afternoon until Monday afternoon, the following aggregate amounts of snow fell above approximately 2400 m: - Lower Valais, regions of Upper Valais from L\u00f6tschental via Leuk into Turtmanntal: 40 to 60 cm, but locally up to 70 cm\n - Rest of the northern Alpine ridge from the Vaud Alps to the Titlis: 20 to 30 cm, but locally up to 40 cm\n - Elsewhere: 10 to 20 cm, but locally up to 30 cm\n - Southern flank of the Alps excluding the southern Simplon region, and in central Grisons and Upper Engadine: a few centimetres or none \n \n \n \nTemperature: At midday at 2000 m: about -1 \u00b0C in the north and about +3 \u00b0C in the south \nWind: From westerly directions - On Sunday night in the west and north, moderate to strong, otherwise light to moderate \n \n - During the day on the northern flank of the Alps and in the high Alpine regions, moderate to strong, otherwise light to moderate\n \n In Ticino, light to moderate north foehn\nMonday night will be frequently cloudy with light precipitation. South of the main Alpine ridge, the night will be clear. During the day in the north, there will be variable cloud with showers and occasional sunny spells. The snowfall level will be approximately 1500 m. The south will be fairly sunny, but convective cloud will build up in the afternoon. \nFresh snow: From Monday afternoon until Tuesday afternoon above approximately 2000 m: \n - Lower Valais, northern Alpine ridge: 5 to 10 cm, but locally up to 20 cm \n \n - Elsewhere: a few centimetres, but none on the southern flank of the Alps \n \n \n \nTemperature: At midday at 2000 m: between 0 \u00b0C in the north and +4 \u00b0C in the south \nWind: Moderate to strong from the west to northwest, easing during the day", "bulletinID": "8948668", "avalancheActivityComment": "The wind slabs of the last few days represent the main danger. Avalanches can reach medium size. The number and size of avalanche prone locations will increase with altitude. \n In very isolated cases avalanches can also release deeper layers of the snowpack and reach large size. Careful route selection is recommended. As a consequence of solar radiation wet avalanches are possible, even large ones in isolated cases. This applies especially on steep north facing slopes below approximately 2500 m, as well as on steep east, south and west facing slopes below approximately 2800 m. The Avalanche Warning Service currently has only a small amount of information that has been collected in the field, so that the avalanche danger should be investigated especially thoroughly in the relevant locality." }, { "regions": [ { "regionID": "CH-6114" }, { "regionID": "CH-6115" }, { "regionID": "CH-6122" }, { "regionID": "CH-6212" }, { "regionID": "CH-6121" } ], "validTime": { "startTime": "2021-05-17T17:00:00+02:00", "endTime": "2021-05-18T17:00:00+02:00" }, "source": {}, "dangerRatings": [ { "elevation": { "lowerBound": "2400" }, "customData": [], "mainValue": "moderate", "aspect": [ "N", "NE", "E", "SE", "S", "SW", "W", "NW" ] } ], "avalancheProblems": [], "tendency": { "validTime": {}, "tendencyComment": "Wednesday: In the north there will be variable cloud with precipitation and occasional sunny spells. The snowfall level will be approximately 1300 m to 1500 m. On the southern flank of the Alps it will be quite sunny with convective cloud and local showers as the day progresses. \n The danger of dry avalanches will not change significantly. In the regions with precipitation, moist snow avalanches are likely to be released in the fresh snow in case of exposure to solar radiation. On each of the coming days in the south, the danger of wet snow avalanches will increase as the day progresses. \nThursday: Wednesday night will be predominantly clear on the southern flank of the Alps. Otherwise, a little further precipitation will fall over a wide area; above approximately 1400 m it will fall as snow. During the day it will be mostly sunny in the west and south. The east will become increasingly sunny once the residual cloud disperses in the morning. \n The danger of dry avalanches will decrease slowly. The danger of wet snow avalanches will vary during the day." }, "publicationTime": "2021-05-17T17:00:00+02:00", "avalancheActivityHighlights": "Considerable avalanche danger will be encountered over a wide area", "snowpackStructureComment": "A sometimes strong southwesterly to northwesterly wind has transported the fresh snow and loosely bonded old snow near the surface in recent days. Snow drift accumulations have formed, some of which are deep. Fresh snow and snow drift accumulations are prone to triggering at elevated altitudes. In some places, avalanches can release deeper layers of the snowpack. At elevated altitudes, conditions are more wintry than usual at this time of year. \n The old snowpack is thoroughly moist below 2500 m on north facing slopes, and up to approximately 3000 m on east, south and west facing slopes. Both wet snow and gliding avalanches remain possible, in particular under the influence of solar radiation.", "wxSynopsisComment": "Sunday night was mostly very cloudy, except in the far south. Precipitation fell over a wide area, most heavily in the west. The snowfall level dropped during the night to approximately 1400 m. During the day it was mostly very cloudy in the west, but there was variable cloud with showers and sunny spells in the north. The snowfall level was approximately 1600 m. On the southern flank of the Alps it was quite sunny with a northerly wind, but convective cloud built up during the day. \nFresh snow: From Sunday afternoon until Monday afternoon, 20 to 40 cm of snow fell in Lower Valais, and 10 to 20 cm fell in the rest of Valais and on the rest of the northern Alpine ridge, as well as in some regions of northern Grisons and in Lower Engadine. Given the showery nature of the precipitation, local differences in the amounts were substantial in some cases. From Saturday afternoon until Monday afternoon, the following aggregate amounts of snow fell above approximately 2400 m: - Lower Valais, regions of Upper Valais from L\u00f6tschental via Leuk into Turtmanntal: 40 to 60 cm, but locally up to 70 cm\n - Rest of the northern Alpine ridge from the Vaud Alps to the Titlis: 20 to 30 cm, but locally up to 40 cm\n - Elsewhere: 10 to 20 cm, but locally up to 30 cm\n - Southern flank of the Alps excluding the southern Simplon region, and in central Grisons and Upper Engadine: a few centimetres or none \n \n \n \nTemperature: At midday at 2000 m: about -1 \u00b0C in the north and about +3 \u00b0C in the south \nWind: From westerly directions - On Sunday night in the west and north, moderate to strong, otherwise light to moderate \n \n - During the day on the northern flank of the Alps and in the high Alpine regions, moderate to strong, otherwise light to moderate\n \n In Ticino, light to moderate north foehn\nMonday night will be frequently cloudy with light precipitation. South of the main Alpine ridge, the night will be clear. During the day in the north, there will be variable cloud with showers and occasional sunny spells. The snowfall level will be approximately 1500 m. The south will be fairly sunny, but convective cloud will build up in the afternoon. \nFresh snow: From Monday afternoon until Tuesday afternoon above approximately 2000 m: \n - Lower Valais, northern Alpine ridge: 5 to 10 cm, but locally up to 20 cm \n \n - Elsewhere: a few centimetres, but none on the southern flank of the Alps \n \n \n \nTemperature: At midday at 2000 m: between 0 \u00b0C in the north and +4 \u00b0C in the south \nWind: Moderate to strong from the west to northwest, easing during the day", "bulletinID": "8948665", "avalancheActivityComment": "The wind slabs of the last few days represent the main danger. They are mostly small but can in some cases be released easily. Avalanches can reach medium size. Backcountry touring calls for careful route selection. As a consequence of solar radiation wet avalanches are possible, even large ones in isolated cases. This applies especially on steep north facing slopes below approximately 2500 m, as well as on steep east, south and west facing slopes below approximately 2800 m. The Avalanche Warning Service currently has only a small amount of information that has been collected in the field, so that the avalanche danger should be investigated especially thoroughly in the relevant locality." }, { "regions": [ { "regionID": "CH-1113" }, { "regionID": "CH-1112" }, { "regionID": "CH-2133" }, { "regionID": "CH-2132" }, { "regionID": "CH-2111" }, { "regionID": "CH-1233" }, { "regionID": "CH-1311" }, { "regionID": "CH-1213" }, { "regionID": "CH-3311" }, { "regionID": "CH-1231" }, { "regionID": "CH-3224" }, { "regionID": "CH-1121" }, { "regionID": "CH-2124" }, { "regionID": "CH-2121" }, { "regionID": "CH-3223" }, { "regionID": "CH-2123" }, { "regionID": "CH-3222" }, { "regionID": "CH-1224" }, { "regionID": "CH-1222" }, { "regionID": "CH-1228" }, { "regionID": "CH-1226" }, { "regionID": "CH-1244" }, { "regionID": "CH-3111" }, { "regionID": "CH-1242" }, { "regionID": "CH-1241" }, { "regionID": "CH-3114" }, { "regionID": "CH-1221" } ], "validTime": { "startTime": "2021-05-17T17:00:00+02:00", "endTime": "2021-05-18T17:00:00+02:00" }, "source": {}, "dangerRatings": [ { "elevation": { "lowerBound": "2200" }, "customData": [], "mainValue": "moderate", "aspect": [ "N", "NE", "E", "SE", "W", "NW" ] } ], "avalancheProblems": [], "tendency": { "validTime": {}, "tendencyComment": "Wednesday: In the north there will be variable cloud with precipitation and occasional sunny spells. The snowfall level will be approximately 1300 m to 1500 m. On the southern flank of the Alps it will be quite sunny with convective cloud and local showers as the day progresses. \n The danger of dry avalanches will not change significantly. In the regions with precipitation, moist snow avalanches are likely to be released in the fresh snow in case of exposure to solar radiation. On each of the coming days in the south, the danger of wet snow avalanches will increase as the day progresses. \nThursday: Wednesday night will be predominantly clear on the southern flank of the Alps. Otherwise, a little further precipitation will fall over a wide area; above approximately 1400 m it will fall as snow. During the day it will be mostly sunny in the west and south. The east will become increasingly sunny once the residual cloud disperses in the morning. \n The danger of dry avalanches will decrease slowly. The danger of wet snow avalanches will vary during the day." }, "publicationTime": "2021-05-17T17:00:00+02:00", "avalancheActivityHighlights": "Considerable avalanche danger will be encountered over a wide area", "snowpackStructureComment": "A sometimes strong southwesterly to northwesterly wind has transported the fresh snow and loosely bonded old snow near the surface in recent days. Snow drift accumulations have formed, some of which are deep. Fresh snow and snow drift accumulations are prone to triggering at elevated altitudes. In some places, avalanches can release deeper layers of the snowpack. At elevated altitudes, conditions are more wintry than usual at this time of year. \n The old snowpack is thoroughly moist below 2500 m on north facing slopes, and up to approximately 3000 m on east, south and west facing slopes. Both wet snow and gliding avalanches remain possible, in particular under the influence of solar radiation.", "wxSynopsisComment": "Sunday night was mostly very cloudy, except in the far south. Precipitation fell over a wide area, most heavily in the west. The snowfall level dropped during the night to approximately 1400 m. During the day it was mostly very cloudy in the west, but there was variable cloud with showers and sunny spells in the north. The snowfall level was approximately 1600 m. On the southern flank of the Alps it was quite sunny with a northerly wind, but convective cloud built up during the day. \nFresh snow: From Sunday afternoon until Monday afternoon, 20 to 40 cm of snow fell in Lower Valais, and 10 to 20 cm fell in the rest of Valais and on the rest of the northern Alpine ridge, as well as in some regions of northern Grisons and in Lower Engadine. Given the showery nature of the precipitation, local differences in the amounts were substantial in some cases. From Saturday afternoon until Monday afternoon, the following aggregate amounts of snow fell above approximately 2400 m: - Lower Valais, regions of Upper Valais from L\u00f6tschental via Leuk into Turtmanntal: 40 to 60 cm, but locally up to 70 cm\n - Rest of the northern Alpine ridge from the Vaud Alps to the Titlis: 20 to 30 cm, but locally up to 40 cm\n - Elsewhere: 10 to 20 cm, but locally up to 30 cm\n - Southern flank of the Alps excluding the southern Simplon region, and in central Grisons and Upper Engadine: a few centimetres or none \n \n \n \nTemperature: At midday at 2000 m: about -1 \u00b0C in the north and about +3 \u00b0C in the south \nWind: From westerly directions - On Sunday night in the west and north, moderate to strong, otherwise light to moderate \n \n - During the day on the northern flank of the Alps and in the high Alpine regions, moderate to strong, otherwise light to moderate\n \n In Ticino, light to moderate north foehn\nMonday night will be frequently cloudy with light precipitation. South of the main Alpine ridge, the night will be clear. During the day in the north, there will be variable cloud with showers and occasional sunny spells. The snowfall level will be approximately 1500 m. The south will be fairly sunny, but convective cloud will build up in the afternoon. \nFresh snow: From Monday afternoon until Tuesday afternoon above approximately 2000 m: \n - Lower Valais, northern Alpine ridge: 5 to 10 cm, but locally up to 20 cm \n \n - Elsewhere: a few centimetres, but none on the southern flank of the Alps \n \n \n \nTemperature: At midday at 2000 m: between 0 \u00b0C in the north and +4 \u00b0C in the south \nWind: Moderate to strong from the west to northwest, easing during the day", "bulletinID": "8948664", "avalancheActivityComment": "The wind slabs of the last few days represent the main danger. The number and size of avalanche prone locations will increase with altitude. Avalanches can be released, even by small loads in isolated cases and reach medium size. \n Careful route selection is recommended. As a consequence of solar radiation wet avalanches are possible. From starting zones where no previous releases have taken place in particular on north and east facing slopes these can in isolated cases reach large size. The Avalanche Warning Service currently has only a small amount of information that has been collected in the field, so that the avalanche danger should be investigated especially thoroughly in the relevant locality." }, { "regions": [ { "regionID": "CH-5212" }, { "regionID": "CH-7112" }, { "regionID": "CH-7111" }, { "regionID": "CH-5216" }, { "regionID": "CH-5215" }, { "regionID": "CH-7222" }, { "regionID": "CH-7221" }, { "regionID": "CH-7211" }, { "regionID": "CH-2224" }, { "regionID": "CH-6113" }, { "regionID": "CH-5223" }, { "regionID": "CH-5233" }, { "regionID": "CH-6211" }, { "regionID": "CH-6111" }, { "regionID": "CH-6112" } ], "validTime": { "startTime": "2021-05-17T17:00:00+02:00", "endTime": "2021-05-18T17:00:00+02:00" }, "source": {}, "dangerRatings": [ { "elevation": { "lowerBound": "2800" }, "customData": [], "mainValue": "considerable", "aspect": [ "N", "NE", "E", "SE", "W", "NW" ] } ], "avalancheProblems": [], "tendency": { "validTime": {}, "tendencyComment": "Wednesday: In the north there will be variable cloud with precipitation and occasional sunny spells. The snowfall level will be approximately 1300 m to 1500 m. On the southern flank of the Alps it will be quite sunny with convective cloud and local showers as the day progresses. \n The danger of dry avalanches will not change significantly. In the regions with precipitation, moist snow avalanches are likely to be released in the fresh snow in case of exposure to solar radiation. On each of the coming days in the south, the danger of wet snow avalanches will increase as the day progresses. \nThursday: Wednesday night will be predominantly clear on the southern flank of the Alps. Otherwise, a little further precipitation will fall over a wide area; above approximately 1400 m it will fall as snow. During the day it will be mostly sunny in the west and south. The east will become increasingly sunny once the residual cloud disperses in the morning. \n The danger of dry avalanches will decrease slowly. The danger of wet snow avalanches will vary during the day." }, "publicationTime": "2021-05-17T17:00:00+02:00", "avalancheActivityHighlights": "Considerable avalanche danger will be encountered over a wide area", "snowpackStructureComment": "A sometimes strong southwesterly to northwesterly wind has transported the fresh snow and loosely bonded old snow near the surface in recent days. Snow drift accumulations have formed, some of which are deep. Fresh snow and snow drift accumulations are prone to triggering at elevated altitudes. In some places, avalanches can release deeper layers of the snowpack. At elevated altitudes, conditions are more wintry than usual at this time of year. \n The old snowpack is thoroughly moist below 2500 m on north facing slopes, and up to approximately 3000 m on east, south and west facing slopes. Both wet snow and gliding avalanches remain possible, in particular under the influence of solar radiation.", "wxSynopsisComment": "Sunday night was mostly very cloudy, except in the far south. Precipitation fell over a wide area, most heavily in the west. The snowfall level dropped during the night to approximately 1400 m. During the day it was mostly very cloudy in the west, but there was variable cloud with showers and sunny spells in the north. The snowfall level was approximately 1600 m. On the southern flank of the Alps it was quite sunny with a northerly wind, but convective cloud built up during the day. \nFresh snow: From Sunday afternoon until Monday afternoon, 20 to 40 cm of snow fell in Lower Valais, and 10 to 20 cm fell in the rest of Valais and on the rest of the northern Alpine ridge, as well as in some regions of northern Grisons and in Lower Engadine. Given the showery nature of the precipitation, local differences in the amounts were substantial in some cases. From Saturday afternoon until Monday afternoon, the following aggregate amounts of snow fell above approximately 2400 m: - Lower Valais, regions of Upper Valais from L\u00f6tschental via Leuk into Turtmanntal: 40 to 60 cm, but locally up to 70 cm\n - Rest of the northern Alpine ridge from the Vaud Alps to the Titlis: 20 to 30 cm, but locally up to 40 cm\n - Elsewhere: 10 to 20 cm, but locally up to 30 cm\n - Southern flank of the Alps excluding the southern Simplon region, and in central Grisons and Upper Engadine: a few centimetres or none \n \n \n \nTemperature: At midday at 2000 m: about -1 \u00b0C in the north and about +3 \u00b0C in the south \nWind: From westerly directions - On Sunday night in the west and north, moderate to strong, otherwise light to moderate \n \n - During the day on the northern flank of the Alps and in the high Alpine regions, moderate to strong, otherwise light to moderate\n \n In Ticino, light to moderate north foehn\nMonday night will be frequently cloudy with light precipitation. South of the main Alpine ridge, the night will be clear. During the day in the north, there will be variable cloud with showers and occasional sunny spells. The snowfall level will be approximately 1500 m. The south will be fairly sunny, but convective cloud will build up in the afternoon. \nFresh snow: From Monday afternoon until Tuesday afternoon above approximately 2000 m: \n - Lower Valais, northern Alpine ridge: 5 to 10 cm, but locally up to 20 cm \n \n - Elsewhere: a few centimetres, but none on the southern flank of the Alps \n \n \n \nTemperature: At midday at 2000 m: between 0 \u00b0C in the north and +4 \u00b0C in the south \nWind: Moderate to strong from the west to northwest, easing during the day", "bulletinID": "8948663", "avalancheActivityComment": "The wind slabs of the last few days represent the main danger. Dry avalanches can be released, even by a single winter sport participant and reach medium size. In very isolated cases avalanches can also release deeper layers of the snowpack and reach large size. \n Backcountry touring calls for experience in the assessment of avalanche danger and careful route selection. As a consequence of solar radiation wet avalanches are possible, even large ones in isolated cases. This applies especially on steep north facing slopes below approximately 2500 m, as well as on steep east, south and west facing slopes below approximately 2800 m. The Avalanche Warning Service currently has only a small amount of information that has been collected in the field, so that the avalanche danger should be investigated especially thoroughly in the relevant locality." }, { "regions": [ { "regionID": "CH-5211" }, { "regionID": "CH-4213" }, { "regionID": "CH-4231" }, { "regionID": "CH-4232" }, { "regionID": "CH-2134" }, { "regionID": "CH-4214" }, { "regionID": "CH-1234" }, { "regionID": "CH-2212" }, { "regionID": "CH-2211" }, { "regionID": "CH-1232" }, { "regionID": "CH-4224" }, { "regionID": "CH-4242" }, { "regionID": "CH-4241" }, { "regionID": "CH-4244" }, { "regionID": "CH-4243" }, { "regionID": "CH-2122" }, { "regionID": "CH-4225" }, { "regionID": "CH-1247" }, { "regionID": "CH-3112" }, { "regionID": "CH-1246" }, { "regionID": "CH-3113" }, { "regionID": "CH-1245" }, { "regionID": "CH-1227" }, { "regionID": "CH-2223" }, { "regionID": "CH-2221" }, { "regionID": "CH-1243" }, { "regionID": "CH-2222" } ], "validTime": { "startTime": "2021-05-17T17:00:00+02:00", "endTime": "2021-05-18T17:00:00+02:00" }, "source": {}, "dangerRatings": [ { "elevation": { "lowerBound": "2500" }, "customData": [], "mainValue": "considerable", "aspect": [ "N", "NE", "E", "SE", "S", "W", "NW" ] } ], "avalancheProblems": [], "tendency": { "validTime": {}, "tendencyComment": "Wednesday: In the north there will be variable cloud with precipitation and occasional sunny spells. The snowfall level will be approximately 1300 m to 1500 m. On the southern flank of the Alps it will be quite sunny with convective cloud and local showers as the day progresses. \n The danger of dry avalanches will not change significantly. In the regions with precipitation, moist snow avalanches are likely to be released in the fresh snow in case of exposure to solar radiation. On each of the coming days in the south, the danger of wet snow avalanches will increase as the day progresses. \nThursday: Wednesday night will be predominantly clear on the southern flank of the Alps. Otherwise, a little further precipitation will fall over a wide area; above approximately 1400 m it will fall as snow. During the day it will be mostly sunny in the west and south. The east will become increasingly sunny once the residual cloud disperses in the morning. \n The danger of dry avalanches will decrease slowly. The danger of wet snow avalanches will vary during the day." }, "publicationTime": "2021-05-17T17:00:00+02:00", "avalancheActivityHighlights": "Considerable avalanche danger will be encountered over a wide area", "snowpackStructureComment": "A sometimes strong southwesterly to northwesterly wind has transported the fresh snow and loosely bonded old snow near the surface in recent days. Snow drift accumulations have formed, some of which are deep. Fresh snow and snow drift accumulations are prone to triggering at elevated altitudes. In some places, avalanches can release deeper layers of the snowpack. At elevated altitudes, conditions are more wintry than usual at this time of year. \n The old snowpack is thoroughly moist below 2500 m on north facing slopes, and up to approximately 3000 m on east, south and west facing slopes. Both wet snow and gliding avalanches remain possible, in particular under the influence of solar radiation.", "wxSynopsisComment": "Sunday night was mostly very cloudy, except in the far south. Precipitation fell over a wide area, most heavily in the west. The snowfall level dropped during the night to approximately 1400 m. During the day it was mostly very cloudy in the west, but there was variable cloud with showers and sunny spells in the north. The snowfall level was approximately 1600 m. On the southern flank of the Alps it was quite sunny with a northerly wind, but convective cloud built up during the day. \nFresh snow: From Sunday afternoon until Monday afternoon, 20 to 40 cm of snow fell in Lower Valais, and 10 to 20 cm fell in the rest of Valais and on the rest of the northern Alpine ridge, as well as in some regions of northern Grisons and in Lower Engadine. Given the showery nature of the precipitation, local differences in the amounts were substantial in some cases. From Saturday afternoon until Monday afternoon, the following aggregate amounts of snow fell above approximately 2400 m: - Lower Valais, regions of Upper Valais from L\u00f6tschental via Leuk into Turtmanntal: 40 to 60 cm, but locally up to 70 cm\n - Rest of the northern Alpine ridge from the Vaud Alps to the Titlis: 20 to 30 cm, but locally up to 40 cm\n - Elsewhere: 10 to 20 cm, but locally up to 30 cm\n - Southern flank of the Alps excluding the southern Simplon region, and in central Grisons and Upper Engadine: a few centimetres or none \n \n \n \nTemperature: At midday at 2000 m: about -1 \u00b0C in the north and about +3 \u00b0C in the south \nWind: From westerly directions - On Sunday night in the west and north, moderate to strong, otherwise light to moderate \n \n - During the day on the northern flank of the Alps and in the high Alpine regions, moderate to strong, otherwise light to moderate\n \n In Ticino, light to moderate north foehn\nMonday night will be frequently cloudy with light precipitation. South of the main Alpine ridge, the night will be clear. During the day in the north, there will be variable cloud with showers and occasional sunny spells. The snowfall level will be approximately 1500 m. The south will be fairly sunny, but convective cloud will build up in the afternoon. \nFresh snow: From Monday afternoon until Tuesday afternoon above approximately 2000 m: \n - Lower Valais, northern Alpine ridge: 5 to 10 cm, but locally up to 20 cm \n \n - Elsewhere: a few centimetres, but none on the southern flank of the Alps \n \n \n \nTemperature: At midday at 2000 m: between 0 \u00b0C in the north and +4 \u00b0C in the south \nWind: Moderate to strong from the west to northwest, easing during the day", "bulletinID": "8948667", "avalancheActivityComment": "The new snow and wind slabs of the last few days are prone to triggering. Dry avalanches can be released, even by a single winter sport participant and reach medium size. In isolated cases avalanches can also release deeper layers of the snowpack and reach large size. \n Backcountry touring calls for experience in the assessment of avalanche danger. As a consequence of solar radiation wet avalanches are possible, even large ones. This applies especially on steep north facing slopes below approximately 2500 m, as well as on steep east, south and west facing slopes below approximately 2800 m. The Avalanche Warning Service currently has only a small amount of information that has been collected in the field, so that the avalanche danger should be investigated especially thoroughly in the relevant locality." }, { "regions": [ { "regionID": "CH-4211" }, { "regionID": "CH-4116" }, { "regionID": "CH-4223" }, { "regionID": "CH-4115" }, { "regionID": "CH-4222" }, { "regionID": "CH-4221" }, { "regionID": "CH-4212" }, { "regionID": "CH-4121" }, { "regionID": "CH-1114" }, { "regionID": "CH-4215" }, { "regionID": "CH-4125" }, { "regionID": "CH-4112" }, { "regionID": "CH-4124" }, { "regionID": "CH-4111" }, { "regionID": "CH-4123" }, { "regionID": "CH-4114" }, { "regionID": "CH-4113" }, { "regionID": "CH-4122" }, { "regionID": "CH-1225" }, { "regionID": "CH-1223" }, { "regionID": "CH-1312" } ], "validTime": { "startTime": "2021-05-17T17:00:00+02:00", "endTime": "2021-05-18T17:00:00+02:00" }, "source": {}, "dangerRatings": [ { "elevation": { "lowerBound": "2500" }, "customData": [], "mainValue": "considerable", "aspect": [ "N", "NE", "E", "SE", "S", "SW", "W", "NW" ] } ], "avalancheProblems": [], "tendency": { "validTime": {}, "tendencyComment": "Wednesday: In the north there will be variable cloud with precipitation and occasional sunny spells. The snowfall level will be approximately 1300 m to 1500 m. On the southern flank of the Alps it will be quite sunny with convective cloud and local showers as the day progresses. \n The danger of dry avalanches will not change significantly. In the regions with precipitation, moist snow avalanches are likely to be released in the fresh snow in case of exposure to solar radiation. On each of the coming days in the south, the danger of wet snow avalanches will increase as the day progresses. \nThursday: Wednesday night will be predominantly clear on the southern flank of the Alps. Otherwise, a little further precipitation will fall over a wide area; above approximately 1400 m it will fall as snow. During the day it will be mostly sunny in the west and south. The east will become increasingly sunny once the residual cloud disperses in the morning. \n The danger of dry avalanches will decrease slowly. The danger of wet snow avalanches will vary during the day." }, "publicationTime": "2021-05-17T17:00:00+02:00", "avalancheActivityHighlights": "Considerable avalanche danger will be encountered over a wide area", "snowpackStructureComment": "A sometimes strong southwesterly to northwesterly wind has transported the fresh snow and loosely bonded old snow near the surface in recent days. Snow drift accumulations have formed, some of which are deep. Fresh snow and snow drift accumulations are prone to triggering at elevated altitudes. In some places, avalanches can release deeper layers of the snowpack. At elevated altitudes, conditions are more wintry than usual at this time of year. \n The old snowpack is thoroughly moist below 2500 m on north facing slopes, and up to approximately 3000 m on east, south and west facing slopes. Both wet snow and gliding avalanches remain possible, in particular under the influence of solar radiation.", "wxSynopsisComment": "Sunday night was mostly very cloudy, except in the far south. Precipitation fell over a wide area, most heavily in the west. The snowfall level dropped during the night to approximately 1400 m. During the day it was mostly very cloudy in the west, but there was variable cloud with showers and sunny spells in the north. The snowfall level was approximately 1600 m. On the southern flank of the Alps it was quite sunny with a northerly wind, but convective cloud built up during the day. \nFresh snow: From Sunday afternoon until Monday afternoon, 20 to 40 cm of snow fell in Lower Valais, and 10 to 20 cm fell in the rest of Valais and on the rest of the northern Alpine ridge, as well as in some regions of northern Grisons and in Lower Engadine. Given the showery nature of the precipitation, local differences in the amounts were substantial in some cases. From Saturday afternoon until Monday afternoon, the following aggregate amounts of snow fell above approximately 2400 m: - Lower Valais, regions of Upper Valais from L\u00f6tschental via Leuk into Turtmanntal: 40 to 60 cm, but locally up to 70 cm\n - Rest of the northern Alpine ridge from the Vaud Alps to the Titlis: 20 to 30 cm, but locally up to 40 cm\n - Elsewhere: 10 to 20 cm, but locally up to 30 cm\n - Southern flank of the Alps excluding the southern Simplon region, and in central Grisons and Upper Engadine: a few centimetres or none \n \n \n \nTemperature: At midday at 2000 m: about -1 \u00b0C in the north and about +3 \u00b0C in the south \nWind: From westerly directions - On Sunday night in the west and north, moderate to strong, otherwise light to moderate \n \n - During the day on the northern flank of the Alps and in the high Alpine regions, moderate to strong, otherwise light to moderate\n \n In Ticino, light to moderate north foehn\nMonday night will be frequently cloudy with light precipitation. South of the main Alpine ridge, the night will be clear. During the day in the north, there will be variable cloud with showers and occasional sunny spells. The snowfall level will be approximately 1500 m. The south will be fairly sunny, but convective cloud will build up in the afternoon. \nFresh snow: From Monday afternoon until Tuesday afternoon above approximately 2000 m: \n - Lower Valais, northern Alpine ridge: 5 to 10 cm, but locally up to 20 cm \n \n - Elsewhere: a few centimetres, but none on the southern flank of the Alps \n \n \n \nTemperature: At midday at 2000 m: between 0 \u00b0C in the north and +4 \u00b0C in the south \nWind: Moderate to strong from the west to northwest, easing during the day", "bulletinID": "8948666", "avalancheActivityComment": "The new snow and wind slabs of the last few days are prone to triggering. Dry avalanches can be released, even by a single winter sport participant and reach large size. Individual natural avalanches are possible. In particular on north and east facing slopes these can release the saturated snowpack and can reach as far as areas without any snow cover. \n Backcountry touring calls for experience in the assessment of avalanche danger and restraint. As a consequence of solar radiation wet avalanches are possible, even large ones. This applies especially on steep north facing slopes below approximately 2500 m, as well as on steep east, south and west facing slopes below approximately 2800 m. The Avalanche Warning Service currently has only a small amount of information that has been collected in the field, so that the avalanche danger should be investigated especially thoroughly in the relevant locality." } ]